I don't think a real giant killing is possible now. Most teams play reserves and squad players. I have never heard of most of the Arsenal team that beat Sutton.
Arsenal
13Ospina
Colombia Internatial5Gabriel
Brazilian defender ex Villareal
20Mustafi
German International16Holding
England U2118Monreal
Spain International35Elneny Substituted for Oxlade-Chamberlain
Egypt International replaced by England International29Xhaka
Swiss International31Reine-Adelaide Substituted for Maitland-Niles
19yr old French midfielder replaced by 19yr old English midfielder14Walcott
England International9Pérez
Spaniard signed from Deportivo 17Iwobi Substituted for Sánchez at 74'
Nigeria International replaced by Chile InternationalIf you've never heard of most of them you don't watch much football! The majority are regulars in the Arsenal matchday squad and full internationals!